Clustered PV inverters in LV networks: An overview of impacts and comparison of voltage control strategies

A high penetration of solar photovoltaic (PV) resources into distribution networks may create voltage rise problem when the generation from PV resources substantially exceeds the load demand. To reduce the voltage rise, the excess amount of power from the solar PV units needs to be reduced. In this paper, distributed storage systems are proposed for the mitigation of voltage rise problem. The surplus energy from the solar PV is used to charge the distributed storage units during midday, when the power from the solar PV would be typically higher than the load level. This stored energy is then used to reduce the peak load in the evening. An intelligent strategy for charging and discharging control to make effective use of the storage capacity is discussed. The proposed voltage rise mitigation strategy is verified on a practical low voltage distribution feeder in Australia. © 2012 IEEE.

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“…where: 4 , and K 5 are the coefficients of the polynomial of the charging voltage expression and x denotes the charging state, SoC.…”

Section: B Battery Storage Device Modelmentioning

confidence: 99%

“…Authors in [4] have proposed active power curtailment and reactive power absorption for voltage rise reduction. Active power curtailment may not be an attractive solution from economic point of view; reactive power absorption may create high reactive power flow over the network, especially for networks with high R/X ratio.…”

Section: Introductionmentioning

confidence: 99%

Distributed energy storage for mitigation of voltage-rise impact caused by rooftop solar PV

Alam

Muttaqi

Sutanto

2012

2012 IEEE Power and Energy Society General Meeting

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“…Locations that have consistent weather patterns that last over entire days have relatively low variability. The main effect of short-timescale PV variability due to cloud motion on distribution feeders is that it causes voltage fluctuations [5], [6], [7], [8], [9], [10], [11]. This voltage volatility can potentially create voltage problems since existing control devices have been implemented to manage voltage due to slow load changes.…”

Section: Impact Of Cloud Motion On Solar Pvmentioning

confidence: 99%

Importance of detailed modeling of loads/PV systems connected to secondary of distribution transformers

Gupta

Rahimi

Broadwater

et al. 2017

2017 North American Power Symposium (NAPS)

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“…Various solutions exist to further increase the injection from renewable energy sources. One of these solutions is to modify the PV's inverters controller to provide reactive power control [1]. Batteries combined with decentralized storage strategy to provide voltage control in Low-Voltage (LV) feeders also help to reduce overvoltages [2], [3].…”

Section: Introductionmentioning

confidence: 99%

Optimal assignment of off-peak hours to lower curtailments in the distribution network

Merciadri

Mathieu

Ernst

et al. 2014

IEEE PES Innovative Smart Grid Technologies, Europe

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Abstract-We consider a price signal with two settings: offpeak tariff and on-peak tariff. Some loads are connected to specific electricity meters which allow the consumption of power only in off-peak periods. Historically, off-peak periods were located during the night and on-peak periods during the day. Changing the assignment of off-peak periods is an easy method for distribution system operators to access to the flexibility of small consumers. This solution can be implemented quickly as the infrastructure needed already exists in some countries.We propose a mixed-integer linear model to assign optimally the off-peak hours so as to minimize a societal cost. This cost gathers together the cost of electricity, the financial losses due to energy curtailments of photovoltaic installations and the loads' wellbeing. Our model considers automatic tripping of inverters and constraints of the electrical distribution networks. Simulation results show that the new disposition of off-peak hours could reduce significantly the photovoltaic energy curtailed in the summer.Index Terms-Mathematical programming, Optimization, Smart grids, Sustainable development. NOMENCLATUREThis section defines the main symbols used in this paper.T \ {0} S nodes S h nodes to which houses are connected K flexible loads G distinct groups g(k) group g ∈ G to which load k belongs K(i) flexible loads connected to node i D days of the time horizon Parameters'pr' is a period. If the chosen timestep is 1 h, pr = h.C ij,t capacity of link (i, j) in period t α t price for 1 kW pr in period t π c consumer's money gain having produced 1 kW pr λ cost for a loss of 1 kW pr on the consumer side η i,t maximum power injected at node i in period t ρ i,t curtailable power production at node i in period t ζ i,t static load power consumption at node i in period t β k,t amount of off-peak periods added tonumber of off-peak periods for group g during day d µ daily maximum number of rate switchings Variables l ij,t power going from node i to node j in period t n i,t power balance at node i in period t r i,t curtailed quantity at node i in period t s k,t state of load k at the end of period t ≥ 0 x k,t fraction of period during which load k consumes power in period t u g,t equals 1 if consumer group g is off-peak in period t, 0 otherwise w k,t auxiliary variable needed in order to define x k,t p i,t variable power consumed at node i in period t z g,t equals 1 if there is a rate switching between periods t − 1 and t

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Clustered PV inverters in LV networks: An overview of impacts and comparison of voltage control strategies

Cited by 106 publications

References 32 publications

Distributed energy storage for mitigation of voltage-rise impact caused by rooftop solar PV

Distributed energy storage for mitigation of voltage-rise impact caused by rooftop solar PV

Importance of detailed modeling of loads/PV systems connected to secondary of distribution transformers

Optimal assignment of off-peak hours to lower curtailments in the distribution network

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